package com.hejia.alauda.utils;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;

public final class TwoDimensionalCodeUtils {
	private static final int BLACK = 0xFF000000;
	private static final int WHITE = 0xFFFFFFFF;

	private TwoDimensionalCodeUtils() {
	}

	public static BufferedImage toBufferedImage(BitMatrix matrix) {
		int width = matrix.getWidth();
		int height = matrix.getHeight();
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		for (int x = 0; x < width; x++) {
			for (int y = 0; y < height; y++) {
				image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
			}
		}
		return image;
	}

	public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		if (!ImageIO.write(image, format, file)) {
			throw new IOException("Could not write an image of format " + format + " to " + file);
		}
	}

	public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		if (!ImageIO.write(image, format, stream)) {
			throw new IOException("Could not write an image of format " + format);
		}
	}
	
	/**
	 * 生成二维码成输出流
	 * @param text		要转换的字符串
	 * @param width		宽度(默认300)
	 * @param height	高度(默认300)
	 * @param margin	边距(默认没有边距)
	 * @param outputStream	
	 * @throws Exception
	 */
	public static void writeToStreamWithSize(String text,Integer width ,Integer height,Integer margin, String color, OutputStream outputStream) throws Exception{
		if(margin==null){
			margin=0;
		}
		if(width==null){
			width=300;
		}
		if(height==null){
			height=300;
		}
		//二维码的图片格式 
		String format = "jpg"; 
		Hashtable hints = new Hashtable(); 
		//边距
		hints.put(EncodeHintType.MARGIN,margin);
		//内容所使用编码 
		hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); 
		BitMatrix bitMatrix = new MultiFormatWriter().encode(text,BarcodeFormat.QR_CODE, width, height, hints); 
		TwoDimensionalCodeUtils.writeToStream(bitMatrix, format, outputStream); 
	}
	
}
